--- /dev/null
+/* notmuch - Not much of an email program, (just index and search)
+ *
+ * Copyright © 2009 Carl Worth
+ * Copyright © 2009 Keith Packard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/ .
+ *
+ * Authors: Carl Worth <cworth@cworth.org>
+ * Keith Packard <keithp@keithp.com>
+ * Austin Clements <aclements@csail.mit.edu>
+ */
+
+#include "notmuch-client.h"
+
+/* Context that gets inherited from the root node. */
+typedef struct mime_node_context {
+ /* Per-message resources. These are allocated internally and must
+ * be destroyed. */
+ FILE *file;
+ GMimeStream *stream;
+ GMimeParser *parser;
+ GMimeMessage *mime_message;
+
+ /* Context provided by the caller. */
+ GMimeCipherContext *cryptoctx;
+ notmuch_bool_t decrypt;
+} mime_node_context_t;
+
+static int
+_mime_node_context_free (mime_node_context_t *res)
+{
+ if (res->mime_message)
+ g_object_unref (res->mime_message);
+
+ if (res->parser)
+ g_object_unref (res->parser);
+
+ if (res->stream)
+ g_object_unref (res->stream);
+
+ if (res->file)
+ fclose (res->file);
+
+ return 0;
+}
+
+notmuch_status_t
+mime_node_open (const void *ctx, notmuch_message_t *message,
+ GMimeCipherContext *cryptoctx, notmuch_bool_t decrypt,
+ mime_node_t **root_out)
+{
+ const char *filename = notmuch_message_get_filename (message);
+ mime_node_context_t *mctx;
+ mime_node_t *root;
+ notmuch_status_t status;
+
+ root = talloc_zero (ctx, mime_node_t);
+ if (root == NULL) {
+ fprintf (stderr, "Out of memory.\n");
+ status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+ goto DONE;
+ }
+
+ /* Create the tree-wide context */
+ mctx = talloc_zero (root, mime_node_context_t);
+ if (mctx == NULL) {
+ fprintf (stderr, "Out of memory.\n");
+ status = NOTMUCH_STATUS_OUT_OF_MEMORY;
+ goto DONE;
+ }
+ talloc_set_destructor (mctx, _mime_node_context_free);
+
+ mctx->file = fopen (filename, "r");
+ if (! mctx->file) {
+ fprintf (stderr, "Error opening %s: %s\n", filename, strerror (errno));
+ status = NOTMUCH_STATUS_FILE_ERROR;
+ goto DONE;
+ }
+
+ mctx->stream = g_mime_stream_file_new (mctx->file);
+ g_mime_stream_file_set_owner (GMIME_STREAM_FILE (mctx->stream), FALSE);
+
+ mctx->parser = g_mime_parser_new_with_stream (mctx->stream);
+
+ mctx->mime_message = g_mime_parser_construct_message (mctx->parser);
+
+ mctx->cryptoctx = cryptoctx;
+ mctx->decrypt = decrypt;
+
+ /* Create the root node */
+ root->part = GMIME_OBJECT (mctx->mime_message);
+ root->envelope_file = message;
+ root->nchildren = 1;
+ root->ctx = mctx;
+
+ *root_out = root;
+ return NOTMUCH_STATUS_SUCCESS;
+
+DONE:
+ talloc_free (root);
+ return status;
+}
+
+static int
+_signature_validity_free (GMimeSignatureValidity **proxy)
+{
+ g_mime_signature_validity_free (*proxy);
+ return 0;
+}
+
+static mime_node_t *
+_mime_node_create (const mime_node_t *parent, GMimeObject *part)
+{
+ mime_node_t *node = talloc_zero (parent, mime_node_t);
+ GError *err = NULL;
+
+ /* Set basic node properties */
+ node->part = part;
+ node->ctx = parent->ctx;
+ if (!talloc_reference (node, node->ctx)) {
+ fprintf (stderr, "Out of memory.\n");
+ talloc_free (node);
+ return NULL;
+ }
+
+ /* Deal with the different types of parts */
+ if (GMIME_IS_PART (part)) {
+ node->nchildren = 0;
+ } else if (GMIME_IS_MULTIPART (part)) {
+ node->nchildren = g_mime_multipart_get_count (GMIME_MULTIPART (part));
+ } else if (GMIME_IS_MESSAGE_PART (part)) {
+ /* Promote part to an envelope and open it */
+ GMimeMessagePart *message_part = GMIME_MESSAGE_PART (part);
+ GMimeMessage *message = g_mime_message_part_get_message (message_part);
+ node->envelope_part = message_part;
+ node->part = GMIME_OBJECT (message);
+ node->nchildren = 1;
+ } else {
+ fprintf (stderr, "Warning: Unknown mime part type: %s.\n",
+ g_type_name (G_OBJECT_TYPE (part)));
+ talloc_free (node);
+ return NULL;
+ }
+
+ /* Handle PGP/MIME parts */
+ if (GMIME_IS_MULTIPART_ENCRYPTED (part)
+ && node->ctx->cryptoctx && node->ctx->decrypt) {
+ if (node->nchildren != 2) {
+ /* this violates RFC 3156 section 4, so we won't bother with it. */
+ fprintf (stderr, "Error: %d part(s) for a multipart/encrypted "
+ "message (must be exactly 2)\n",
+ node->nchildren);
+ } else {
+ GMimeMultipartEncrypted *encrypteddata =
+ GMIME_MULTIPART_ENCRYPTED (part);
+ node->decrypt_attempted = TRUE;
+ node->decrypted_child = g_mime_multipart_encrypted_decrypt
+ (encrypteddata, node->ctx->cryptoctx, &err);
+ if (node->decrypted_child) {
+ node->decrypt_success = node->verify_attempted = TRUE;
+ node->sig_validity = g_mime_multipart_encrypted_get_signature_validity (encrypteddata);
+ } else {
+ fprintf (stderr, "Failed to decrypt part: %s\n",
+ (err ? err->message : "no error explanation given"));
+ }
+ }
+ } else if (GMIME_IS_MULTIPART_SIGNED (part) && node->ctx->cryptoctx) {
+ if (node->nchildren != 2) {
+ /* this violates RFC 3156 section 5, so we won't bother with it. */
+ fprintf (stderr, "Error: %d part(s) for a multipart/signed message "
+ "(must be exactly 2)\n",
+ node->nchildren);
+ } else {
+ /* For some reason the GMimeSignatureValidity returned
+ * here is not a const (inconsistent with that
+ * returned by
+ * g_mime_multipart_encrypted_get_signature_validity,
+ * and therefore needs to be properly disposed of.
+ *
+ * In GMime 2.6, they're both non-const, so we'll be able
+ * to clean up this asymmetry. */
+ GMimeSignatureValidity *sig_validity = g_mime_multipart_signed_verify
+ (GMIME_MULTIPART_SIGNED (part), node->ctx->cryptoctx, &err);
+ node->verify_attempted = TRUE;
+ node->sig_validity = sig_validity;
+ if (sig_validity) {
+ GMimeSignatureValidity **proxy =
+ talloc (node, GMimeSignatureValidity *);
+ *proxy = sig_validity;
+ talloc_set_destructor (proxy, _signature_validity_free);
+ }
+ }
+ }
+
+ if (node->verify_attempted && !node->sig_validity)
+ fprintf (stderr, "Failed to verify signed part: %s\n",
+ (err ? err->message : "no error explanation given"));
+
+ if (err)
+ g_error_free (err);
+
+ return node;
+}
+
+mime_node_t *
+mime_node_child (const mime_node_t *parent, int child)
+{
+ GMimeObject *sub;
+
+ if (!parent || child < 0 || child >= parent->nchildren)
+ return NULL;
+
+ if (GMIME_IS_MULTIPART (parent->part)) {
+ if (child == 1 && parent->decrypted_child)
+ sub = parent->decrypted_child;
+ else
+ sub = g_mime_multipart_get_part
+ (GMIME_MULTIPART (parent->part), child);
+ } else if (GMIME_IS_MESSAGE (parent->part)) {
+ sub = g_mime_message_get_mime_part (GMIME_MESSAGE (parent->part));
+ } else {
+ /* This should have been caught by message_part_create */
+ INTERNAL_ERROR ("Unexpected GMimeObject type: %s",
+ g_type_name (G_OBJECT_TYPE (parent->part)));
+ }
+ return _mime_node_create (parent, sub);
+}
notmuch_bool_t
debugger_is_active (void);
+/* mime-node.c */
+
+/* mime_node_t represents a single node in a MIME tree. A MIME tree
+ * abstracts the different ways of traversing different types of MIME
+ * parts, allowing a MIME message to be viewed as a generic tree of
+ * parts. Message-type parts have one child, multipart-type parts
+ * have multiple children, and leaf parts have zero children.
+ */
+typedef struct mime_node {
+ /* The MIME object of this part. This will be a GMimeMessage,
+ * GMimePart, GMimeMultipart, or a subclass of one of these.
+ *
+ * This will never be a GMimeMessagePart because GMimeMessagePart
+ * is structurally redundant with GMimeMessage. If this part is a
+ * message (that is, 'part' is a GMimeMessage), then either
+ * envelope_file will be set to a notmuch_message_t (for top-level
+ * messages) or envelope_part will be set to a GMimeMessagePart
+ * (for embedded message parts).
+ */
+ GMimeObject *part;
+
+ /* If part is a GMimeMessage, these record the envelope of the
+ * message: either a notmuch_message_t representing a top-level
+ * message, or a GMimeMessagePart representing a MIME part
+ * containing a message.
+ */
+ notmuch_message_t *envelope_file;
+ GMimeMessagePart *envelope_part;
+
+ /* The number of children of this part. */
+ int nchildren;
+
+ /* True if decryption of this part was attempted. */
+ notmuch_bool_t decrypt_attempted;
+ /* True if decryption of this part's child succeeded. In this
+ * case, the decrypted part is substituted for the second child of
+ * this part (which would usually be the encrypted data). */
+ notmuch_bool_t decrypt_success;
+
+ /* True if signature verification on this part was attempted. */
+ notmuch_bool_t verify_attempted;
+ /* For signed or encrypted containers, the validity of the
+ * signature. May be NULL if signature verification failed. If
+ * there are simply no signatures, this will be non-NULL with an
+ * empty signers list. */
+ const GMimeSignatureValidity *sig_validity;
+
+ /* Internal: Context inherited from the root iterator. */
+ struct mime_node_context *ctx;
+
+ /* Internal: For successfully decrypted multipart parts, the
+ * decrypted part to substitute for the second child. */
+ GMimeObject *decrypted_child;
+} mime_node_t;
+
+/* Construct a new MIME node pointing to the root message part of
+ * message. If cryptoctx is non-NULL, it will be used to verify
+ * signatures on any child parts. If decrypt is true, then cryptoctx
+ * will additionally be used to decrypt any encrypted child parts.
+ *
+ * Return value:
+ *
+ * NOTMUCH_STATUS_SUCCESS: Root node is returned in *node_out.
+ *
+ * NOTMUCH_STATUS_FILE_ERROR: Failed to open message file.
+ *
+ * NOTMUCH_STATUS_OUT_OF_MEMORY: Out of memory.
+ */
+notmuch_status_t
+mime_node_open (const void *ctx, notmuch_message_t *message,
+ GMimeCipherContext *cryptoctx, notmuch_bool_t decrypt,
+ mime_node_t **node_out);
+
+/* Return a new MIME node for the requested child part of parent.
+ * parent will be used as the talloc context for the returned child
+ * node.
+ *
+ * In case of any failure, this function returns NULL, (after printing
+ * an error message on stderr).
+ */
+mime_node_t *
+mime_node_child (const mime_node_t *parent, int child);
+
#include "command-line-arguments.h"
#endif